Google Alarm Firefox add-on

Get notified when Google is monitoring your web browsing

The Google Alarm Firefox addon visually & audibly alerts you when
your personal information is being sent to Google servers.

Even outside Gmail and YouTube you are constantly sending
information to Google through their vast network of tracking bugs:
Google Analytics, Google AdSense, YouTube embeds, API calls..
all of this data be used to monitor & track your personal web browsing habits.